Efficiency Ratings: Boston College

Using an NBA Efficiency Rating Formula, TDD tracks the best statistical performances of the season

A quick way NBA coaches measure a player's game performance is by evaluating his efficiency. In order to find a player's efficiency the following formula is used:

((Points + Rebounds + Assists + Steals + Blocks) - ((Field Goals Att. - Field Goals Made) + (Free Throws Att. - Free Throws Made) + Turnovers)).

For example, compare the following stat lines:

Player A: 17 points (5-of-22 FG, 7-9 FT), 8 rebounds, 6 assists, 3 steals, 4 turnovers.

Player B: 15 points (5-8 FG, 3-4 FT), 4 rebounds, 7 assists, 2 turnovers

Who had the better game? Using the above referenced formula player B, who hit five of eight shots and committed two turnovers registered a +20 efficiency total while Player A who missed 17 shots and had four turnovers had just a +11 rating.


Okafor scored a career-high 28 points to lead the second-ranked Blue Devils' 85-62 rout of Boston College on Saturday.

Okafor, a 50-percent foul shooter, was 14 of 17 from the line -- both bests for the preseason All-American.

"Coach K just said something to me after the game: What happened to my free throws?" Okafor said with a laugh.

Quinn Cook added 15 points and the Blue Devils (13-0, 1-0) had little trouble winning their Atlantic Coast Conference opener.

They shot 47 percent and used runs of 17-2 and 14-0 to pull away for their 41st straight victory at Cameron Indoor Stadium -- the longest active streak in the nation.

Olivier Hanlan finished with 22 points for the Eagles (7-5, 0-1), who have lost two of three. They never got closer than 10 in the second half.

BC was just 7 of 10 from the foul line while the Blue Devils were 22 of 29.


(change from previous game)

Notes: Okafor continues to put up monster games. For the first 12 games of the season the only issue with his overall performance was at the foul line. Against the Eagles, however, the Duke center knocked down his first 10 attempts and finished 14-of-17. If he’s going to start hitting his foul shots at even a 65 percent rate, he’ll continue to create huge separation gaps in both these ratings and the various Player of the Year awards.

Quietly, Justise Winslow has gotten more and more efficient since Christmas. Over the last two games he’s average a 20.5 efficiency rating including a +22 against Boston College. The upward trend has included steady all around games (points, rebounds, assists), but also better shooting percentages and the usually sprinkling of defensive stats (blocks, steals).

One player who had a big night on the stat sheet but not in the efficiency score was Cook. The senior finished with 15 points in 34 minutes, but shot just 5-of-14 from the field and committed three turnovers against just two assists. Things weren’t too much better for Tyus Jones who logged a season low +2 score after missing all five of his field goal attempts and logging a 3-4-3 score in points, boards, and assists.

With their point guards not overly efficient, Duke got a big boost (on both ends of the floor) from Matt Jones and Rasheed Sulaimon. The duo combined for a +22 in 49 minutes played, while Marshall Plumlee’s four blocks and six rebounds combined to produce a +13.


Throughout the season TDD will track the various highs and lows using the formula.

Ten Most Efficient Performances

  • Jahlil Okafor v. Elon (+37)
  • Jahlil Okafor v. Furman (+32)
  • Jahlil Okafor v. Boston College (+32)
  • Amile Jefferson v. Furman (+30)
  • Jahlil Okafor v. Wofford (+30)
  • Jahlil Okafor v. Toledo (+28)
  • Jahlil Okafor v. Presbyterian (+28)
  • Tyus Jones v. Army (+27)
  • Tyus Jones v. Toledo (+27)
  • Tyus Jones v. Wisconsin (+25)

Five Least Efficient Performances*

  • Rasheed Sulaimon (-6) v. Connecticut
  • Rasheed Sulaimon (-4) v. Temple
  • Grayson Allen (-3) v. Boston College
  • Matt Jones (-2) v. Elon
  • Grayson Allen (-2) v. Toledo


Cumulative Season ratings for the Blue Devils. (E/game)*
  • Jahlil Okafor +307 (23.6)
  • Tyus Jones +198 (15.2)
  • Quinn Cook +191 (14.7)
  • Amile Jefferson +189 (14.5)
  • Justise Winslow +167 (12.8)
  • Marshall Plumlee +91 (7.0)
  • Rasheed Sulaimon +89 (6.8)
  • Matt Jones +70 (5.4)
  • Grayson Allen +40 (3.6)*

*- Games Factored In: Allen (11)


Cumulative Season ratings per minute for the Blue Devils. (E/minutes)
  • Jahlil Okafor: 0.819
  • Marshall Plumlee: 0.695
  • Amile Jefferson: 0.634
  • Tyus Jones: 0.521
  • Justise Winslow: 0.480
  • Grayson Allen: 0.476
  • Quinn Cook: 0.448
  • Rasheed Sulaimon: 0.360
  • Matt Jones: 0.302


Tracking the most and least efficient performances by player
  • Jahlil Okafor 37 / 13
  • Amile Jefferson 30 / 7
  • Quinn Cook 24 / 6
  • Tyus Jones 27 / 2
  • Grayson Allen 22 / -3
  • Rasheed Sulaimon 20 / -6
  • Justise Winslow 21 / 5
  • Marshall Plumlee 17 / 1
  • Matt Jones 16 / -2


- Okafor is now more than 100 points clear of the next highest scorer on the team. While the next three players are all within nine efficiency points of one another meaning any big games will likely change the standings.

- Allen continues to earn limited minutes, and when he’s in he’s almost pressing to produce. His -3 against BC was his lowest score to date.

- Winslow’s last two games have bumped him from 7th to 5th in the per minute ratings.

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